培优专项训练四 Unit 4 主题阅读训练一、完型填空Computers can injure you. Most other injuries happen suddenly. For example, if you 1???a bike and break your arms, it happens very???2???. But computer injuries happen slowly. You????3????know how to ride a bike safely. Now learn to use a computer safely.Your eyes—? 4???light can injure your eyes,???5???never sit too close to a computer screen. Your eyes should be???6??50 centimeters 7???the screen.? 8??remember to look away from it..